#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int main()
{
 int ret = fork();
 if(ret < 0)
 {
     perror("fork");
     return 1;
 }
else if(ret == 0)
     { //child
        printf("I am child : %d!, ret: %d\n", getpid(), ret);
     }  
 else
 { //father
 printf("I am father : %d!, ret: %d\n", getpid(), ret);
 }
 sleep(1);
 return 0;
}
